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Test method for decomposition characteristics of sulfur hexafluoride at different overheat fault temperatures

A sulfur hexafluoride and characteristic testing technology, which is applied in liquid tightness measurement using liquid/vacuum degree, by measuring the increase and deceleration rate of the fluid, and measuring electricity, etc., can solve the problem of limiting the online application of infrared temperature measuring devices and insulation equipment It is difficult to accurately obtain the real temperature at the fault point, and it is impossible to detect problems such as poor contact in time

Inactive Publication Date: 2019-02-22
STATE GRID CHONGQING ELECTRIC POWER CO ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The usual practice is to diagnose the overall connection status of the equipment circuit by measuring the contact resistance of the entire circuit of the equipment during off-line routine maintenance. Obviously, this method cannot detect the problem of poor contact in time
In the infrared indirect temperature measurement method, due to the strong absorption of infrared light energy by SF6 gas and the complex structure inside the SF6 gas insulation equipment, it is often difficult to accurately obtain the real temperature at the fault point.
In addition, the fully enclosed SF6 gas-insulated equipment and the influence of external complex and changeable environmental factors also limit the online application of existing infrared temperature measuring devices

Method used

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  • Test method for decomposition characteristics of sulfur hexafluoride at different overheat fault temperatures
  • Test method for decomposition characteristics of sulfur hexafluoride at different overheat fault temperatures
  • Test method for decomposition characteristics of sulfur hexafluoride at different overheat fault temperatures

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] Embodiment 1, SO2F2 and SOF4 component characteristic;

[0076] due to SOF 4 The chemical properties are extremely unstable, and it is easy to combine with H in the process of gas production and detection. 2 O is hydrolyzed to produce SO 2 f 2 , while SO 2 f 2 The nature is relatively stable, so the SO 2 f 2 and SOF 4 Consider it as a whole. When the overheating fault temperature is 260℃~500℃, SF 6 SO generated by decomposition 2 f 2 +SOF 4 Such as figure 2 with image 3 shown.

[0077] The following conclusions can be drawn: (1) When the overheating fault temperature is 260-340°C, only a very small amount of SO 2 f 2 +SOF 4 (2 f 2 +SOF 4 The gas concentration began to show different degrees of growth trends with the prolongation of time, but the final maximum was only about 10ppm, and when the overheating fault temperature was higher than 420°C, SO 2 f 2 +SOF 4 The concentration begins to rise sharply in the form of exponential growth, such as ...

Embodiment 2

[0082] Embodiment 2, SOF2 component characteristic;

[0083] Figure 4 with Figure 5 SF shown 6 SOF generated by decomposition under the action of POF under partial overthermal fault (Partial Overthermal Fault, POF) 2 The relationship curve between the content and the failure temperature and failure time. with SO 2 f 2 and SOF 4 Compared with these two decomposed components, in the POF state, SOF 2 The generation amount of SO is significantly higher than that of SO 2 f 2 and SOF 4 The amount of generation is much more, which is 1 to 2 orders of magnitude higher, but the relationship between the amount of generation and POF temperature is similar to that of SO 2 f 2 and SOF 4 The two decomposition components are similar and both increase exponentially with the increase of POF temperature.

[0084] In POF state, SOF 2 The generation properties of are as follows:

[0085] (1)SF 6 Decomposition under the action of POF will generate a large amount of SOF 2 , and w...

Embodiment 3

[0090] Embodiment 3, SO2 component characteristics;

[0091] Image 6 with Figure 7 SF shown 6 Decompose and generate SO under the action of POF within the fault temperature range of 260°C to 500°C 2 characteristic curve. Depend on Image 6 with Figure 7 As can be seen:

[0092] (1) Within the fault temperature range, SF 6 Decomposition can generate SO 2 , its content showed different growth trends with the prolongation of time, and when the fault temperature was higher than 340℃, SO 2 The content growth rate increased sharply in the form of exponential growth.

[0093] (2) Under the same overheating failure time, with the aforementioned several main decomposition products such as SOF 2 , SO 2 f 2 and SOF 4 Same, SO 2 Both the generation rate of and the overheating fault temperature show a strong positive correlation, that is, the higher the temperature, the SO 2 The higher the rate of generation.

[0094] (3) From the point of view of the amount of productio...

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Abstract

The invention discloses a test method for decomposition characteristics of sulfur hexafluoride at different overheat fault temperatures. The method comprises: connecting a test system and checking theairtightness of a closed air chamber in the system; cleaning the closed air chamber, injecting SF6 new gas after vacuumizing of the decomposed closed air chamber, and carrying out vacuumizing again,and repeating the process three times; setting a needed simulated fault temperature value and carrying out testing; and extracting SF6 decomposition component sample gas from a gas extraction hole andcarrying out quantitative analysis on the sample component. According to the invention, the characteristics of the decomposition product of hexafluoride hexafluoride at different temperatures can bedetected; the SF6 decomposition component can be detected comprehensively; and the experimental foundation is laid for studying the SF6 over-heat decomposition phenomenon comprehensively and systematically. Besides, a related component characteristic ratio can be configured based on the foundation so as to represent the severity degree and development trend of the overheat fault.

Description

technical field [0001] The invention relates to the technical field of sulfur hexafluoride decomposition testing, in particular to a method for testing the decomposition characteristics of sulfur hexafluoride at different overheating failure temperatures. Background technique [0002] At present, there is no effective detection and diagnosis method for POF in SF6 gas insulation equipment. The usual practice is to diagnose the overall connection status of the equipment circuit by measuring the contact resistance of the entire circuit of the equipment during off-line routine maintenance. Obviously, this method cannot detect the problem of poor contact in time. In the infrared indirect temperature measurement method, due to the strong absorption of infrared light energy by SF6 gas and the complex structure inside the SF6 gas insulation equipment, it is often difficult to accurately obtain the real temperature at the fault point. In addition, the fully enclosed SF6 gas-insulate...

Claims

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Application Information

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IPC IPC(8): G01R31/00G01M3/26G01N30/02
CPCG01M3/26G01N30/02G01R31/00
Inventor 姚强谢刚文苗玉龙邱妮侯雨杉张施令胡晓锐宫林籍勇亮
Owner STATE GRID CHONGQING ELECTRIC POWER CO ELECTRIC POWER RES INST
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